Effects of bilateral hippocampal lesions were investigated in a newly developed discriminated rearing-avoidance task. A significant facilitation of avoidance conditioning was found in rats with hippocampal lesions. The over-all escape topography of the hippocampal-lesioned rats was mostly jumping whereas that of the controls was rearing. These findings suggest that the hippocampal lesion increases reactivity to shock.
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References
1.
BlackA. H.NadelL.O'KeefeJ.Hippocampal function in avoidance learning and punishment. Psychological Bulletin, 1977, 84, 1107–1129.
2.
de CastroJ. M.HallT. W.Fornix lesions: Effects on active and passive avoidance behavior. Physiological Psychology, 1975, 3, 201–204.
3.
DouglasR. J.The hippocampus and behavior. Psychological Bulletin, 1967, 67, 416–442.
4.
JarrardL. E.The hippocampus and motivation. Psychological Bulletin, 1973, 79, 1–12.
KönigJ. F. R.KlippelR. A.The rat brain. Baltimore: Williams & Williams, 1963.
7.
LovelyR. H.Hormonal dissociation of limbic lesion effects on shuttle box avoidance in rats. Journal of Comparative and Physiological Psychology, 1975, 89, 224–230.
8.
OltonD. S.Shock-motivated avoidance and the analysis of behavior. Psychological Bulletin, 1973, 79, 243–251.
9.
SchmaltzL. W.GiulianD.Faster acquisition of discriminated lever-press avoidance by hippocampectomized rats. Journal of Comparative and Physiological Psychology, 1972, 81, 149–154.
10.
ShimaiS.Rearing/jumping avoidance conditioning in Long Evans rats. Annual of Animal Psychology, 1977, 27, 43–47.
11.
ShimaiS.ImadaH.The effects of shock intensify on discriminated rearing avoidance in rats. Japanese Psychological Research, 1978, 20, 143–147.
12.
ShishimiA.ImadaH.Discriminated and nondiscriminated avoidance conditioning of rearing response in rats. Animal Learning and Behavior, 1977, 5, 259–264.
